In November, a gunman went on a shooting spree at the Rancho Tehama reserve in Northern California, killing four people and injuring three children.

A week before that, a man in Sutherland Springs, Texas, stormed a church with a semiautomatic rifle, killing 26 people and injuring 20.

A month before that, a gunman in a room on the 32nd floor of the Mandalay Bay hotel in Las Vegas shot at concertgoers below, killing 59 people and injuring more than 500.

As shootings like these seem to escalate in the US, so do questions about gun control. Americans who fear their town or city could be the site of the next attack wonder what strategies if any the US could take to reduce rates of gun violence.

No country is a perfect analog of the US, but several have taken steps that worked for them — here are their insights.

Australia paid citizens to sell their guns to the government.

A spate of violence in the 1980s and '90s that culminated in a 1996 shooting that left 35 dead led Australian Prime Minister John Howard to convene an assembly to devise gun-control strategies.

Over the next few years, gun-death totals were cut nearly in half. Firearm suicides dropped to 0.8 per 100,000 people in 2006 from 2.2 in 1995, while firearm homicides dropped to 0.15 per 100,000 people in 2006 from 0.37 in 1995.

Then they have to pass a mental-health evaluation at a hospital, as well as a background check, in which the government digs into any criminal records or ties and interviews friends and family members.

Finally, they can buy only shotguns and air rifles — no handguns — and must retake the class and the initial exam every three years.

Unlike in the US, Japanese law has long outlawed guns. Still, the wisdom from Japan seems to be that tighter regulations keep guns confined only to those fit to use them.

Sociologists who study the Nordic model have found that social cohesion between citizens and the government goes a long way toward ensuring a (mostly) peaceful society.

For example, an analysis in 2015 found that the number of fatal shootings by police in Norway in the past nine years was less than the number of fatal shootings by US police officers in one day.

Gummi Oddsson, a cross-cultural sociologist from Northern Michigan University, has found that Nordic governments go to great lengths to build trust in local communities.

He told Business Insider that US states could look to strengthen a sense of trust through measures like community policing, a tactic that emphasizes partnership between law enforcement and communities.

The thinking goes that people will begin to feel safer around the police, who will then have a better understanding of the neighborhood and be able to address problems before they happen.

The UK took a multipronged approach.

The UK's approach that combines elements of those of the other three countries.

Around when Australia adopted its gun regulations, Parliament passed legislation banning private ownership of handguns in Britain and banned semiautomatic and pump-action firearms throughout the UK. It also required shotgun owners to register their weapons.

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GunPolicy.org estimates that in 2010 there were 3.78 guns per 100 people in the UK, while the US, meanwhile, is estimated to have 101 guns per 100 people.

The result has been roughly 50 to 60 gun deaths a year in England and Wales, which have a population of 56 million. Compare that to the US, a country about six times as large that has more than 160 times as many gun-related homicides.

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